Seagram offered to buy the rest of Mumm’s stock.

The Paris Bourse said Seagram Ltd. of Canada, which already holds about 56.2% of G. H. Mumm et Cie.’s 828,545 shares, is bidding about $80 a share for the rest of the French champagne company. Mumm’s stock was last traded at about $61 a share Dec. 12, before news of the Seagram offer halted trading.